*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}  

body{
    position: relative;
    background-color: white;
}

.header{
    width: 100%;
    height: 80px;
    word-spacing: 20px;
    text-align: center;
    padding-top: 20px;
    color: white;
    background-color: aqua;
    background-image: url(../images/top.jpg);
    background-size: cover;
}

.nav{
    width: 1206px;
    height: 50px;
    margin: 0 auto;
    background-color:lightblue;
    text-decoration: none;
} 

.nav ul{
    list-style-type: none;
}

.nav ul li{
    display:inline-block;
}

.nav ul li a{  display:inline-block;
    width: 237px;
    height: 50px;
    font-family: "仿宋";
    font-size: 25px;
    word-spacing: 20px;
    text-align: center;  
    color: black;
    text-decoration: none;
    line-height: 50px;
    transition: 2.5ms;
}

.nav ul li a:hover{
    background-color: aqua;
    color:white;
    cursor: pointer;
}

.mains{
    position: relative;
    width: 100%;
    height: 700px;
}

.main{
    width: auto;
    height: 700px;
}

.footer{
    width: 100%;
    height: 100px;
    font-family: "楷体";
    font-size: 20px;
    padding-top: 4px;
    color: white;
    word-spacing: 20px;
    text-align: center;
    background-image: url(../images/bottom.jpg);
    background-size: cover;
}
